Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 50: Suche nach Supersymmetrie II

T 50.2: Talk

Wednesday, March 21, 2018, 16:45–17:00, Philo-HS3

Search for electroweak production of supersymmetric states in compressed mass spectra in Run 2 with the ATLAS detector — •Michael Holzbock and Alexander Mann — Ludwig-Maximilians-Universität München

Supersymmetry (SUSY) is one of the best studied and tested extensions of the Standard Model. Although there is no sign of physics beyond the Standard Model yet, SUSY could still be hiding in more challenging signatures, one of them being compressed mass spectra. These scenarios involve small mass differences between heavier SUSY particles and the lightest supersymmetric particle (LSP) leading to the appearance of soft objects in the decay chain.

A search is presented in which the lightest electroweakino states are nearly mass degenerate, leading to final states with one or more soft leptons. Usually, these events are selected using a trigger on missing transverse energy that originates from the SUSY system recoiling against a jet from initial state radiation. This trigger requires a tight cut on missing transverse energy in the offline selection, reducing the signal acceptance significantly. New dedicated triggers with lower thresholds exploiting topological information already at the lowest trigger level have been included in the 2017 data taking to recover signal efficiency in compressed scenarios.

The talk comprises studies on these multi-object triggers and the potential gain in sensitivity for the analysis when a selection based on these triggers is introduced.